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Open Roads Forum  >  Tow Vehicles

 > Ambient Temp Sensor Troubleshooting

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TurnThePage

North ID

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Posted: 11/23/21 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

Right up front, this is not an RV related question, but I know there's tremendous vehicle knowledge and experience to be had here.

We have a 2012 Ford Fusion that doesn't know the outside temperature and thus is unable to heat/cool the inside properly. The temp display will sometimes be accurate briefly, but will soon start drifting downward, eventually bottoming out way below zero, before wandering back upward some. It goes all over the place. Internet research indicated that I should replace the ambient temp sensor, which I did, twice. The sensor I replaced is behind the front bumper and fascia. Is there another sensor? Could a bad fuse cause that behavior? I'm getting ready to remove it all together to see if there's any difference.


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enblethen

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Posted: 11/23/21 03:53pm Link  |  Quote  |  Print  |  Notify Moderator

There should be two. You replaced the one for the engine control and not the heating/cooling system.
My Chrysler has the passenger comparment sensor internal to the temperature control unit.


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Posted: 11/23/21 03:57pm Link  |  Quote  |  Print  |  Notify Moderator

I had a similar problem and like you I replaced the ambient temperature sensor. It didn't fix the problem. I had to replace the ambient temperature sensor connector. That is what fixed my problem.


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Posted: 11/23/21 06:31pm Link  |  Quote  |  Print  |  Notify Moderator

Some cars have 2 sensors, one behind the grille and the other in an outside door mounted mirror.


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Posted: 11/23/21 07:42pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks folks. I'll do some more research.

jfritz_drfritz

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Posted: 11/25/21 08:40am Link  |  Quote  |  Print  |  Notify Moderator

If I understand this correctly you have two problems. The first is that the outside temperature does not display correctly. I would agree that this is likely related to the ambient temperature sensor in front. However, there is almost certainly a separate sensor that measures the interior car temperature. Fixing the outside temp sensor probably would not fix the HVAC problem. Just my opinion I don't know for sure

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Posted: 11/26/21 09:55am Link  |  Quote  |  Print  |  Notify Moderator

So... I've learned that there is only one sensor and it's the one I changed. I've also learned that it's semi-common for the wiring to this sensor to get damaged if there is even minor front damage. When this happened, my wife had hit a snow berm.

Also, this sensor absolutely does influence the HVAC system. In the winter it's not too bad, you can always get heat, usually too much, but you can deal with that by cracking a window.

Shouldn't be too difficult to find the damaged wiring once I get going on it, likely next spring.

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Posted: 11/26/21 10:01am Link  |  Quote  |  Print  |  Notify Moderator

Lol. No mechanic work in the winter?


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enblethen

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Posted: 11/26/21 02:14pm Link  |  Quote  |  Print  |  Notify Moderator

You might want to look at Rockauto.com as they list two!
https://www.rockauto.com/en/catalog/ford........oning,cabin+air+temperature+sensor,14376

TurnThePage

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Posted: 11/26/21 04:34pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the research and feedback. Those items are the cabin air temp sensors.

Just to be clear, we're talking about the ambient temp sensor that displays the outside temp and provides input to the HVAC system.

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